Opening_plugin.rco stores the opening sound.

Don't even attempt to flash it, though - will result in a brick. I've tried extracting the clip from the file, but it's not only too big to fit inside the 3.03 firmware file, it's too long.
In the debug, the sound runs into the XMB; in new firmwares, it's over before everything is finished.

Can someone tell me if it worked for them?

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